The Aimoh #10 security catalog envelopes are perfect for business transactions, with a rectangular shape and a self-seal closure for added security. Made of durable paper with a security tint, these envelopes are ideal for storing and sending sensitive information. Each pack contains 100 envelopes with dimensions of 10 x 13 inches, offering a reliable and discreet solution for your business needs. They are brand new and sealed inside boxes.